Also, he would like to clear the back rank before he castles to give his Rooks greater maneuverability.

At this point I think Black could simply castle when once again I see nothing wrong with his position.

And White lost more than a tempo, more like two or three since it took five bishop and knight moves to make the captures and Black did not lose a tempo with castling and only made two capturing moves with his rook and king.

Phrases

castles in the air (or in Spain)

The neurotic is the type of person who's continuously building dream castles in the air.

Please tell him just to gently post the mail into the box I have so willingly provided, and then tell him to be on his way, to beat his path away from my dreamy semi-consciousness, and leave me to my somnolence, my reverie of castles in the air.

if you have built castles in the air, your work need not be lost; that is where they should be. now put the foundations under them.

Origin

Castle goes back to Latin castellum, ‘little fort’ from castrum ‘fort’. To build castles in the air is to have daydreams or unrealistic fantasies. It comes from a Latin phrase used by St Augustine, who became bishop of Hippo in North Africa in ad 396. Another version, originally a translation from medieval French, is to build castles in Spain. This country was probably chosen because it was a distant place where it would have been extremely unrealistic to build—most of it was under the rule of the Moors at the time the phrase was first used in French.